1971413609 has 16 divisors (see below), whose sum is σ = 2268552960. Its totient is φ = 1694322000.

The previous prime is 1971413581. The next prime is 1971413641. The reversal of 1971413609 is 9063141791.

It is a cyclic number.

It is not a de Polignac number, because 1971413609 - 2¹² = 1971409513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1971412609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93014 + ... + 112224.

It is an arithmetic number, because the mean of its divisors is an integer number (141784560).

Almost surely, 2^1971413609 is an apocalyptic number.

1971413609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1971413609 is a deficient number, since it is larger than the sum of its proper divisors (297139351).

1971413609 is a wasteful number, since it uses less digits than its factorization.

1971413609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1971413609 is about 44400.6037008507. The cubic root of 1971413609 is about 1253.8894550790.

The spelling of 1971413609 in words is "one billion, nine hundred seventy-one million, four hundred thirteen thousand, six hundred nine".